One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(7,8)(25,26,31,32)(27,33,29,28)(30,34,38,39)(35,40,37,36)(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,19)(13,14)(16,20)(17,21)(18,24)(22,23)(25,27,31,29)(26,28,32,33)(30,37,38,35)(34,40,39,36)(1,3,5,4)(2,7,6,8)(10,14)(11,17)(16,19)(18,23)(26,32)(27,29)(34,39)(35,37)(1,3,5,4)(2,7,6,8)(9,10)(11,15)(12,16)(13,14)(17,21)(18,22)(19,20)(23,24)(25,28,31,33)(26,27,32,29)(30,36,38,40)(34,35,39,37)(9,11,13,17)(10,15,14,21)(12,18,20,23)(16,22,19,24)(25,29,31,27)(26,33,32,28)(30,37,38,35)(34,40,39,36)(1,4,5,3)(2,8,6,7)(9,12)(10,16)(11,18)(13,20)(14,19)(15,22)(17,23)(21,24)(25,30,31,38)(26,34,32,39)(27,35,29,37)(28,36,33,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.